Fix CTS test failing on TV

   The testSetFeatureDrawable test was failing on TV because it used to reply on the
Window.FEATURE_OPTIONS_PANEL always being present, but that was recently disabled by
default on TV targets.
   Changed the test to now use FEATURE_LEFT_ICON instead.
   Also, changed the tests to run on the UI thread.

Bug: 19184480
Change-Id: I7d826839c47fb8fecdfdeb5c241c9f0b653a3546
1 file changed